What is JavaScript? Describe It.

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Mostly, JavaScript stands out as a programming language. It adds interactivity to web pages.

This programming language is used for developing front-end applications and running in a web browser.

JavaScript is used with a mixture of HTML and CSS for building web pages and internet applications.

It is a client-side script language which means that it is run by the user’s web browser rather than on the server.

Some common tasks that are performed with JavaScript include:

  1. Validating form input
  2. Creating drop-down menus
  3. Displaying dynamic content
  4. Creating image galleries
  5. Sending and receiving cookies

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Why it is important?

It’s an important tool for modern websites nearly all web browsers support it.

JavaScript is used to create a wide range of applications, including mobile and desktop applications, games, and more.

For building Single Page Applications (SPA) javascript plays an important role.

SPAs are web applications that load a single HTML page and dynamically update the page as the user interacts with the app.

This more fluid and responsive user experience and the user does not need to wait for the server to send a new web page every time they perform an action.

Example Of JavaScript

Below explaining of a simple example of javascript that displays a message on a web page.

<!DOCTYPE html>

<h1>My Web Page</h1>

<button onclick="sayHello()">Click me</button>

function sayHello() {
  alert('Hello World');


In this example, there is a button on the page with an onclick attribute that calls a JavaScript function called sayHello(). When the button is clicked, the sayHello() function is executed and an alert box appears with the message “Hello World”.

This is just a simple example, but it illustrates how JavaScript can be used to add interactivity to a web page. There are many other things that can be done with JavaScript, including validating form input, creating animations, and much more.


JavaScript is a powerful and flexible language, and it is one of the most widely used programming languages on the web. For anyone interested in web development or building interactive web applications

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Lingaraj Senapati

Hey There! I am Lingaraj Senapati, the Founder of lingarajtechhub.com My skills are Freelance, Web Developer & Designer, Corporate Trainer, Digital Marketer & Youtuber.

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